Drilling-machine.



C. A` HULTQUIST.

DRILLING MACHINE.

APPLICATION mw Dec. 2. 191s.

1,221,862., Patented Apr. 10, 1917.

CHARLES A. HULTQUIST, OF LOS ANGELES, CALIFORNIA.

DRILLINGr-MACHINE.

fm-...m Specification of Letters vPatent.

Patent-ea apr. io, raft.

Application filed December 2, 1916. Serial No. 134,726.

To all whom t may concern.'

Be it known that l, CimnLns A. ll'UL'r- QUIs'r, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Drilling-Machine, of which the following is a specification.

rlhis invention pertains to devices of the characterdesigned to cause turning of the drill steel of pneumatic tools such, for instance, as stoping machines and an object of thefinvention is to effect such turning of the drill by mechanism of maximum simplicity and effectiveness.

Another object is to produce mechanism of this character in which the power impulse for turning the drill will be delivered to the body of the drilling machine to the best advantage and without the use of gear wheels.

Other objects and advantages will appear in the subjoined detail description.

The accompanying drawings illustrate the invention:

Figure l is a side elevation of a drilling machine equipped with the invention, portions of the drill, feed cylinder and handle being broken away to contract the view.

Fig. 2 is an elevation mainly in sect-ion on the irregular line indicated by w2-a2, Fig. 3.

Fig. 3 is .an enlarged -plan section on line indicated by ac3- m3, Fig. 1.

Fig. 4 is an elevation partly in section on line indicated by 4-a4, Fig. 2.

Fig. 5 is a fragmental sectional elevation on the irregular line indicated by 4115+005, Fig. 4.

There is provided a cylinder 1 having at one end thereof a chuck 2 to hold a drill steel 3 in a manner well understood in the art. The opposite end of the cylinder 1 is provided with a feed cylinder 4 having therein a feed piston 5 operated by compressed iluid so as to press the drill against the material to be drilled as is well understood in the art. rllhe type of drilling machine illustrated in Fig. 1 is generally termed la stoping machine but the features of the invention hereinafter to be described may be used in connection with other types of drilling machines.

rlhe cylinder 1 and the feed cylinder 4 constitute the body of the drilling machine and means are provided-to turn or oscillate said body7 about its longitudinal axis and said means will now be described. The feed cylinder 4, or other suitable portion of the body, is journaled in bushings 6 of bearings 7 which are formed at opposite sides of a transversely disposed member comprising' a semicylindrical casing or jacket 8 and cylinders 9, 10 another. The cylinders 9, 10 are provided with intake ports 11, 12 respectively which communicate with a valve device 13 of any suitable type capable of being operated by compressed fluid so as to alternatively'admit operating liuid to the ports 11, 12. The air supply pipe for the valve device 13 is indicated at 14.

llhe cylinders 9, l() are provided with pistons 15, 16 respectively adapted to be forced inward by the air admitted to the cylinders by the valve device 13,' .and said 4cylinders are connected by pins 17 to piston rods 18, 19 respectively which in turn are pivoted at 20 to radial arms 21 of a collar 22 that is tightly clamped by means of a bolt 23 onto the feed cylinder 4, there being a slot 24 in the collar so as to allow the bolt 23 to be drawn up to produce the clamping raction of the collar. iquivalent means could be used to fasten the collar 22 in place.

The collar 22 is of just sufficient thickness to lit between the adjacent ends of the bearings 7 so as to form a thrust collar or shoulder on the cylinder 4 between said bearings and thereby prevent movement of the casing 8 and cylinders 9, 10 lengthwise of the feed cylinder 4.

The' mechanism for producing blows on the drill steel 3 is not shown and described in detail as said mechanism 'may be of any suitable construction and is well understood in the art and is not a part of this invention.

The throttle valve handle is indicated at 25 and fastened to the cylinders 9, l0 is a handle 26. In practice to operate the drilling machine, the operator will grasp the handle 26 to steady the machine yand to hold the cylinders 9, l() stationary and will turn on the compressed air by operating the throttle valve handle 25v in a manner well understood in the art so as to produce blows on the drill steel 3 and to produce pressure in the feed cylinder 4 and will open the valve 27 to reciprocate the valve device 13 to admit compressed air alternatively to the cylinders 9, 10 behind the respective pistons 15, 16.

Assuming that the parts are inthe posi arranged parallel with onei tions shown in Figs.

3 and 5, it is clear that will flow from the valve device 13 through the port 11 into the cylinder 9 so as to force the piston 15 on its out stroke so as to turn the collar 22 in the the compressed air direction of the arrow a, Fig. 3, thus to turn the feed cylinder L and thereby turn the drill steel 3 to the left in Fig. 1. At the same time the rod 19 moves the piston 16 inward.

Then the valve device 13 will be operated in a manner well understood in the art to cut off the air supply from the port 11 and l 10 so as to oscillate the feed cylinder 4:, the

oscillations of said feed cylinder being transmittedvto the drill steel 3 so as to produce the desired changes in the relation of its eutting edgesto the surfaces acted on by the drill steel. A

l am aware that pistons have been used in connection with spur gearing to turn the drill steel in prior devices, but it is noted that by the herein before described construction gear wheels are dispensed with, and, since it is wellY known that there is confive cents each, by

siderable wear to gear wheels, it is clear that the described construction will outwear those devices employing gear wheels.

I claim:

1. The combination with the body of a drilling machine, of a collar fastened to said body, a casing surrounding said collar and journaling the body of the drilling machine, a pair of cylinders connected to the casing, a valve device to admit operating Huid alternatively to the cylinders, and pistons in the cylinders connected with said collar.

2. The combination with the body of a drilling machine, of a casing provided with bearings to journal said body, a collar fastened to said body and interposed between the adjacent ends of said bearings, cylinders connected with the casing, pistons in the cylinders, and rods pivoted to the pistons and to the collar to operate said collar.

3. The combination with the cylinder of a drilling machine, of a collar fastened to said cylinder, bearings to journal said cylinder, cylinders connected with said bearings, pistons in the cylinders connected with the collar, and a valve device to admit an operating fluid to the last named cylinders alternatively.

Signed at Los Angeles, Californnr, this Qilth day of November 1916.

CHARLES A. HULTQUIST.

Witnesses:

GEORGE H. HrLns, ANNA F. SCHMIDTBAUER.

addressing the Commissioner of Patents,

Washington, D. C. 

